This is going to be short, but one of the questions we should ask ourselves as interpreters of Paul is how did he read Scripture?
I believe Paul looked past Scripture and attempted to decipher it through the lens of Christ. Meaning, he wasn’t always the “historicist” (or literalist) we want to make him out to be. Let me give you two examples.
The first is rather small:
Do I say this on human authority? Does not the law say the same? For it is written in the law of Moses, “You shall not muzzle an ox when it is treading out the grain.” Is it for oxen that God is concerned? Does he not speak entirely for our sake? It was written for our sake, because the plowman should plow in hope and the thresher thresh in hope of a share in the crop. (1 Co. 9.8–10)
The “biggest” use of Paul’s “other reading” is found in Galatians 4.24–26:
Now this is an allegory: these women are two covenants. One is from Mount Sinai, bearing children for slavery; she is Hagar. Now Hagar is Mount Sinai in Arabia; she corresponds to the present Jerusalem, for she is in slavery with her children. But the Jerusalem above is free, and she is our mother.
Paul sees something in this story that he is able to bring out in order to help his readers understand the Gospel. It may simply be Paul sees in the Genesis passage what he says he sees in the Deuteronomic passage — something written for us, for the new age under Christ.
So, then, why would we think Paul is intent on seeing the Genesis story as an historical event rather than a literary event (dare we say myth)? In Romans 5, the story of Adam’s great sin is used not so much as a way to tell us who evil and depraved we are (thanks, Jean) but to tell us how great the grace of Christ is. Jesus is not seen as the “Second Adam” but as one greater than Adam.
Now, to be sure, Paul uses this metaphor in 1 Cor 15.44–49 and in 2 Cor 3.13–18; however, there is a deeper exegesis required than that which is usually given.
So, how do we understand Paul and his use of allegory? Does he see some of the Torah as allegory or does he use allegory to shape the Torah under the lens of Christ? Regardless, Paul does not necessarily require a historical event or historical meaning (hence the, “this was written for us!”) in order to understand the stories of his people as continuing and being made alive under the lens of his fellow Jew, Jesus.